I feel your pain man, when I first started playing with tight line nymphing and was looking into leader make ups it was nuts.
lengths and styles and kinds all over the board. So I ended going with what was termed a "standard" length of leader, X amount from fly line to indicator/sighter then X length of sighter, then x length of tippet. As I nymphed I found that my arms/ shoulder grew tired quickly as the day went along. I started playing with the length of the leader from fly line to sighter to find one that didn't wear me out but was still suitable for nymphing. I read that George D. uses 3-4' of tippet from his sighter down to the point fly and that handles most of the water here in Pa. if it doesn't you adjust from there. So I used that length and a foot of sighter as a starting point and built the rest from there. Through a lot of trial & error I found that for my build, arm length/height using a ten foot rod that 5' of leader from the fly line to the sighter 1' of sighter and 3-4' of tippet ( this length sometimes boarders on 5') was ideal for me and the different depths of water that I've encountered in my fishing. I then knew I had to make the leader "casting" friendly for dries, wets, & streamers.
This is the leader formula that I eventually came up with:
18" 35lb
14" 25lb
11" 20lb
10" 15.5lb
7" 13.5lb
12" 10lb sighter
then 3-4' tippet that's the same diameter to quickly get your flies down to the bottom ( some or none of your sighter and tippet is really the only thing under water) that fact lead me to taper my leader down to the sighter with confidence.
Make sure your tippet material is not stronger than your sighter, that way if you break off it will usually be below the sighter and only tippet will be lost.
This does it all for me, is it the "perfect" dry fly leader? Nope, but then I don't do a lot of dry fly fishing.
Hope this helps you out, good luck.